Compressor



Dec. 25, 1934. M HE D ET A 1,985,841

COMPRESSOR Filed Feb. 23, 1932 5 Sheets-Sheet l gwuentocs dmym 5, 934 M. s. SHEPHERD ET AL 1,985,84

COMPRES SOR Filed Feb. 25, 1932 5 Sheets-Sheet 2 la/r Dec. 25, 1934. M, s, HE H E D ET AL 1,985,841

I COMPRESSOR Filed Feb. 25, 1932 5 Sheets-Sheet 3 and Dec. 25, 1934. M. s. SHEPHERD 5% AL ,8

Y I COMPRESSOR V Filed Feb. 25, 1932 5 Sheets-Sheet 4 Dec. 25 1934. I M. SJSHIEPHERQD AL 1,985,341

COMPRESSOR Filed Feb. 23, 1932 5 Sheets-Sheet 5 Patented Dec. 25, 1934 a ooMnREssom. t t

Milton sif fs'hennetai'a a Frames: Wiley, Salt 1 LakQQity;iitailh assignoi sof one-thirdto Louis- AuRose fsalt flakeEity; man r All i ti ni-Eehnuapyv 23, 1932,1fSerial :No. 594,443

's-oneti e} (ol pzsemoy j Ourinvention re1ates-wmmpressers: and-has gure I]: is a plan View ofthe suctio'nvalvefor-its object 'toprovide a new and:{eiiilmen fluid Cagecompressor for use primarily in frefiigeigt i n' a Figure: 12 is a: diametrical. section of a commachines. 1 i pressor lcylinder and-i piston showing a modified 5' A furthe bj'e fq tprbvid a"bmfirssdr-L fonmof discharge valvewitha plurality of valves which s a newtypelof'noiseless-intake mounted: in the discharge valvecage with one haust valves -Uwm a v x v m l m-c t val te shownsectioned'andtthe otherin elevation.

, than those used heretofore; giving greater corir;-"= 1' s mvertedrplanl f the base pressibility toany type-ofcompress'o'r whet-uses thwdischalge Valve cage Showmg foul therein i I P ingsitherein. i

A- still-furtherobjectis to-pi'ovide a sirn'plifiedf i u ea w 1 P construction n a a s in Flgurelhisagverticaldiametrlcalsection of-onestabilize theoperation"ofthe'valvesandto make Elev-anon 0f thel nng base;

them noiseless in opeiati'on. o F E W W e e A stillfurtherobjectiS'to piovide construe- 7 :3" plan 015 Figure monof -intake orsuction valve Whichis, so bunt mfthegdmwmgs' f m dlscha-rgeas to have longer-life'ah'dto prevent boundin and suctmnvalves ascarned acylmder f of the lockflhut threon; i l imthe piston B; of anymftheoonventionaltypes t A still further objetis to providqi ddmpre$m oftcompressors and-: with the discharge valve C which has-thesuction valve so constfutw'that t d' cage composed W whenstarting horloadd's. carriedllunti th s cj'iom members: 3 by bolts p prssor has attainedvsumcientslspeedhto the lowenmemheiv3iformedwltha centrally dis-l suction Valve inthe Distant. s I t posed valve seat 5. A flange and bosses 7 space These objects" we accomplis withthe d'eVifcie; tm p fi m m m Thfemcylmder 25 illustrated in, the accompanyihgfdrawl walls'sjljolilthefcylmdenA ls'provldedwlth F indicate like partsthroughqutthe se er'arvie s er m a lgmen eimem and as describedflmithe, specificdfibhtfbrmmg: ah superimposedthereoteru The. top side of the part of this appnafion,andtjpoifited f i V inember 2:0txtheeageis'provldedzwith'an annular 39 appendedmaim,

t i F ring flange 10, to hold a pressure'springl l cenv t. it titally: thereover: and the cylinder head cover l2 g? :23 is; then placedi thereover: and. securedtby suitable invention bolts iwith thepressureof; the spring holding the l i assembled cageinplaceinthecylinderh The up- 2 5355 3 p g gg g ggg 5): pen-:memben 2 of the ca-gelis composedof a block charge and suction, valves used, in; chnriecltion. b m i t p or formed on the therewith V a t l i i i Y on side and having a central tthieaded perfora- FW i 1 di tion therethnough; inwhichaiplug 14w lsscrewed.

I e r 5 -he, t f i me. $9 9 Intolthegboss L4 fromthe bottomsideof the memthrough the dlscharge Valve on -9 m bBIE'Z? we. provide acylindrical bore. 15 and in the 11 I p g v face oi"; theblock-we:provideianenlarged bore16 I gure 3 1s an mverted p V WQ t e withi a; closureiguideaplatel'l'fitting: into; the bore por Ion of. the valve: c 1-6' toclose. the openinglof the bore 15. The plate '45 Figure 5 e elevation 0fFigu1BF3- 't. 1'7iis cen.tral1y perforated to receivethe valve stem Figure 515 p an view-oi the valve seat r mmed 18.and 'ai piston-19' is'carried; in the bore 15 above in the lower half of the cage. the platez'lflawith the end' of'thezstem. 18 threaded Figurefiis a; sideelevationtofifi gure 5: into the piston and secui edtthereto by alocking Figure (is a verticaldzametricalisectiomofthe screw,-20. nspring-l 21 iscarried overthetopt of discharge valve-unline. 7-7: of: F gurezts the pistomlQrto normally hold thepiston down. to 50 Figure 8;is a vertical: diametrical: sectinntofxthe thebottomof itsvstroke. The valve stem 18 hasa suction valve and cage with the: spring removed; valve-:22 formedvon. the lower. end; said valve to Figure 9 is a3 similar; section to. that shownli seat-gintthevalve 5; n i t 3 Figure 8*;with: the valve removed; l i A milledtchtyZS;isproVidedinthebore of the i Figure-102m anoutside elevationsofsthe cage: platediadjacentthe stemtlt toiallow air-pressure construction and .at the same time having the pressure against the pistonto use the involved pressure to act against the closing of the piston to counterbalance the pressure on the top side of the valve making the valve more noiseless; when closing.

The suction valve D is carried in a cage 25- which cage is cylindrical in form and provided with a flange 26 therearound adapted to fit into asocket 27 in the piston head B, and be secured therein by placing an annular ring 28 thereabove resting on the flange 26 andflttinginto an annular step 29 in the piston head. The ring is s e cured by spaced apart tap screws 30. The bottom endof the cylindrical cage 25- is formed intoa support bearing 31 extending up into the bore of the cylinder to support .the valve stem therein and the lower end of the block is provided with an env larged bore 33 in which a piston 32 is carried, said piston being secured onto the lower end of the valve stem 24 by threads and by a. locking bolt 35. A small port 36 is bored through the side wall of the block into communication with the chamber 37 above the piston 32 in the bore 33. 'This is to allow air to be forced from the chamber when the valve is opening, but the port is bored into the chamber a short distance from the end thereof so that the piston when rising in the chamber moves freely until just before it reaches the end of its stroke and the end of the stroke willbe cushioned by the compression of'thei air in the chamber 37 abovethe piston 32. The top inner edge of the block 31 is "inwardly chamfered-to provide an oil retaining well to catch andretain oil for lubrica-x tion of the valve stem. Ports 29 through the side walls of the cage 25 provide air passage there into from the space surrounding the piston in the cylinder A.

The piston B of the device is of the usual compressor type having a head. and skirt joined together by vertical struts leaving .an air space between the skirt and head which 'space is joined into the circuit of the system in which the. compressor is being used or to the'atmosphere if air is being compressed. i

For large compressors where high pressure. is required wehave provided a multiplicity of discharge valves in the discharge cage as shown in Figures 12, 13, 14, 16 and 17 of the drawings;

The cage is made of a head 40 and base 41 carried in the cylinder step out as is the other discharge cage. The base 41is provided with spaced apart sockets .42 with a valve seat 44 formed in the bottom of the socket and. with the ports 43 passing down through the base. Within the sockets 42 we then place annular port rings 45, said rings being provided with ports therethrough to allow fluid pressure to pass therefrom. The top inner side of the rings is step out and into thestep out we place circular plates '46, said'plates having a flange 4'7 thereon the diameter of the step out to fit thereinto withthe balance of the plate of smaller diameter to fit up into cylindrical caps 48. The caps 48 have the .lower edge flanged to fit onto the top of the rings 45 and the flange 47 to hold the rings and plate together and the top end of the caps is closed, but'provided with a threadedopening medially therein in which a closure plug is screwed. ,'.Valves:50.

the valve seats 44 by the pressure of the springs 53;" Each valve is set in place and the caps placed thereover and the top head 40 is then placed thereover resting on the top end thereof and the .jlarge spring 56 isthen placed thereover and the "cylinderheadf57 secured holding the entire device securely inplace by spring pressure.

The operation of the device is as follows:

The. piston is drawn down by the crank shaft (not shown) and in being drawn down the valve D in the piston head is opened, letting fluid into the cylinder above the piston head. The piston is then forced up and this compresses the fluid in the-cylinder above the head until suiflcient pressure hasbeen created to open the valve C and allow the fluid to be forced into the space in the cylinder above'the valves and out to any desired source through the pipe line indicated by the dotted lines a in Figure 1. New fluid is at the same time being drawn into the cylinder through the pipe line indicated by dotted lines D in- Figure 1. This operation is continued.

The pressure created in thatspace above the valve seats in the cylinder head is passed through the milled cut into the cylinder 15 above the plates 17 thereby creating a pressure against the piston 19 holding the valve 22 from seating hard enough to create a vibration or noise.

In the form of compressor shown in Figure 12 we have shown the plurality of valves and the piston compresses the fluid forcing the valves 50 open allowingthe pressure to pass out to the desireddestination. The milled cuts 54 in the plates 46 allow the pressure to enter the cap 48 under the piston 52 to'hold the valves from making noise when they close.

Having thus described our invention we desire to secure'by Letters Patent and claim:

1. A discharge valve'comprising a cage; a valve seat in the lower end of the cage. a cylinder in the upper'end ofthe' cage; a valve adapted to open or close said seat; a piston carried on the valve stem within said cylinder; a plate closing the loweropen endof the cylinder with the valve stem operable therethrough; a milled cut through said'plate adjacent the valve stem; and a spring carried in the cylinder pressing on the top of the piston'to normally hold the valve seated.

2. A discharge valve for compressors comprising a cage having a valve seat in the lower portion and a cylinder in the upper portion; a valve carried in said cage; a piston operating in the cyli'nder' connected to the valve by the valve stem; and means to introduce fluid into the cylinder under said piston to use the involved fluid to prevent the valve from vibration and sudden closing.

3. In a multiple discharge valve assembly for compressors, the combination of a cage mounted in the head of a compressor cylinder, said cage formed in two sections formed to fit together; valve seats formed in the lower section with ports leading from the spacev above the .valve seats through the side Walls of the lower section,. cylindrical valve chambers carried in the upper section; plates carried in each valve chamher to close the opening thereinto with an opening through the plate to receive the valve stem and with milled cuts through one edge of said openings to allow for passage of fluid therethrough; valves carried above each seat to normally close the seat with the valve stem extending up into the chamber thereabove through the openingin said plates; a piston carried on each valve stem operable within said chamber to modify and cushion the action of the valves; and springs carried on said pistons within said chambers to normally hold themselves seated.

MILTON S. SHEPHERD. FRANCIS C. WILEY. 

